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docs: clarify value attribute on radio/checkbox inputs is allowed with formField #69313

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docs: clarify value attribute on radio/checkbox inputs is allowed with formField #69313

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14 changes: 12 additions & 2 deletions skills/dev-skills/angular-developer/references/signal-forms.md
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Original file line number Diff line number Diff line change
Expand Up @@ -170,10 +170,20 @@ Do _NOT_ bind the `name` field.
When using `[formField]`, you MUST NOT set the following attributes in the template (either static or bound):

- `min`, `max` (Use validators in the schema instead)
- `value`, `[value]`, `[attr.value]` (Already handled by `[formField]`)
- `value`, `[value]`, `[attr.value]` on **text/number/date inputs** (Already handled by `[formField]`)
- `[attr.min]`, `[attr.max]`
- `[disabled]`, `[readonly]` (Already handled by `[formField]`)

**Exception**: Static `value` on `<input type="radio">` and `<input type="checkbox">` is **allowed and required** — it identifies which option the input represents, not the bound field value.

```html
<!-- CORRECT: value on radio specifies which option this button represents -->
<input type="radio" value="economy" [formField]="bookingForm.package.tier" />

<!-- WRONG: value binding on a regular input -->
<input [value]="someVar" [formField]="form.name" />
```

Do NOT do this: `<input min="1" [formField]>` or `<input [value]="val" [formField]>`.

```html
Expand Down Expand Up @@ -520,7 +530,7 @@ form(
| **Multi-select array** | `<select [formField]="form.tags">` (string[]) | Use checkboxes for array fields |
| **readonly attribute** | `<input readonly [formField]>` | Use `readonly()` rule in schema |
| **min/max attributes** | `<input min="1" max="10">` | Use `min()` and `max()` rules in schema |
| **value binding** | `<input [value]="val">` | Do NOT use `[value]` with `[formField]` |
| **value binding** | `<input [value]="val">` | Do NOT use `[value]` with `[formField]` (static `value` on radio/checkbox is OK) |
| **when option** | `pattern(p.x, /.../, {when: ...})` | `when` only works with `required()` |
| **Submit callback** | `submit(form, () => { ... })` | `submit(form, async () => { ... })` |
| **Async params** | `params: s.field` | `params: ({ value }) => value()` |
Expand Down
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